plural of sleep twitch

A hypnic jerk.

Synonym of no rest for the wicked

(slang, idiomatic) A person who habitually does with little to no sleep during the week and then makes up by sleeping a lot during the weekend.

A trance-like state resulting from the use of opium or opioid drugs such as morphine or heroin. / A drowsy, restless period of sleep caused by the withdrawal of such substances.

Slowed or weakened by recent sleep; drowsy; groggy.

A burst of oscillatory brain activity during stage 2 sleep.

plural of sleep spindle

(idiomatic, chiefly in the negative) To sleep at all.

plural of sleep mask